#!/usr/bin/perl

use strict;
use Benchmark;
use File::Find;
$|++;

my $Usage = "$0 some/path\n";
die $Usage unless @ARGV and -d $ARGV[0];

timethese( 30, {
    "\n Shell find pipe" => \&try_pipe,
    "\n _ Opendir recursion" => \&try_opendir,
    "\n __ File::Find module" => \&try_filefind,
});
print "\n";

sub try_pipe {
    open( my $find, '-|', 'find', $ARGV[0], '-type', 'f' );
    open( my $conf, '>', '/tmp/bm-conf.sh-find' );
    my $counter;
    while (<$find>) {
        print $conf $_;
        $counter++;
    }
    print " $counter\r";
}

sub try_opendir {
    open( my $conf, '>', '/tmp/bm-conf.opendir' );
    my $counter = path_recurse( $ARGV[0], $conf );
    print " $counter\r";
}
sub path_recurse {
    my ( $path, $conf ) = @_;
    my $nfiles;
    opendir( my $dir, $path ) or return;
    while ( my $file = readdir( $dir )) {
        next if ( $file =~ /^\.{1,2}$/ or -l "$path/$file" );
        if ( -f _ ) {
            print $conf "$path/$file\n";
            $nfiles++;
        }
        elsif ( -d _ ) {
            $nfiles += path_recurse( "$path/$file", $conf );
        }
    }
    return $nfiles;
}

sub try_filefind {
    my $counter;
    open( my $conf, '>', '/tmp/bm-conf.filefind' );
    find( sub { if ( ! -l and -f _ ) { $counter++; print $conf "$File::Find::name\n" } }, $ARGV[0] );
    print " $counter\r";
}